Considering the growth of population and economy particularly in the emerging and developing countries, resource demand will continue to increase; and sustainable development cannot be achieved with the current consumption and production patterns. Increasing resource efficiency, sustainable resource management and sustainable consumption and production are essential to achieve sustainable development and ensure our prosperity. In recent years, much attention has been focused on the environmental problems, particularly marine plastic litter issues, resulting from the use of plastics. In order to properly prevent the discharges of plastic litter to the ocean, it is necessary to promote the proper management and recycling of plastics, including resource efficiency. In this sense, promotion of 3Rs (Reduce, Reuse, Recycle) is significantly important, and global concerted action is now required to address these issues. At the G20 Ministerial Meeting on Energy Transitions and Global Environment for Sustainable Growth, Karuizawa (hereafter G20 EEMM 2019) held in June 2019, the "G20 Implementation Framework for Actions on Marine Plastic Litter" was adopted, and endorsed by the leaders at the subsequent G20 Osaka Summit. As a common global vision, the “Osaka Blue Ocean Vision” was shared and agreed by the leaders at the Summit, which aims to reduce additional pollution by marine plastic litter to zero by 2050 through a comprehensive life-cycle approach. In light of these results, this symposium will facilitate reporting of actions on marine plastic litter by the G20 members, and reporting by business and international organizations, as well as introducing the technology for marine plastic litter countermeasures by Japan. Through these information and knowledge exchanges, it is expected that the discussions will lead to identifying the key challenges and necessary actions to be taken, namely policies, measures, business models, towards realization of the “Osaka Blue Ocean Vision”.